Results 81 to 90 of about 95,714 (157)

The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating stars

, 2008
The goal of this paper is to analyze the impact of a primary neutron source on the s-process nucleosynthesis in massive stars at halo metallicity. Recent stellar models including rotation at very low metallicity predict a strong production of primary N14.
Aoki, Aoki, F. Herwig, Farouqi, G. Meynet, Goswami, Hirschi, Langer, M. Pignatari, M. Wiescher, Mishenina, Montes, Pignatari, R. Gallino, R. Hirschi, Rauscher, Travaglio   +16 more
core   +1 more source

Carbon and Nitrogen Stable Isotopic Discrimination Factors Between Diet and Feces in Wild Giant Pandas

Biology
Stable isotope analysis is very useful for studying animal nutritional ecology. Feces are the most accessible and non-invasive samples for short-term dietary reconstruction.
Guoyan Long, Yue Wu, Lu Huang, Yonggang Nie, Han Han   +4 more
doaj   +1 more source

Ratio of natural isotopes of nitrogen. I. Primary results: soils of Dombes [Translation from: Revue d'Ecologie et de Biologie du Sol 14, 279-287, 1977] [PDF]

, 1980
Utilization of the heavy isotope of nitrogen as a tracer has found numerous applications in soil biology. It allows better definition of different stages of the nitrogen cycle, in particular the immobilization-mineralization cycle.
Chalamet, A., Domenach, A. M., Pachiaudi, C.   +2 more
core  

A Three-Dimensional Model of the Marine Nitrogen Cycle during the Last Glacial Maximum Constrained by Sedimentary Isotopes

Frontiers in Marine Science, 2017
Nitrogen is a key limiting nutrient that influences marine productivity and carbon sequestration in the ocean via the biological pump. In this study, we present the first estimates of nitrogen cycling in a coupled 3D ocean-biogeochemistry-isotope model ...
Christopher J. Somes, Andreas Schmittner, Juan Muglia, Andreas Oschlies   +3 more
doaj   +1 more source

Nitrogen isotopes in granite genesis

Chinese Science Bulletin, 1998
Nitrogen content is a very sensitive indicator of the sediment input in granite genesis. For S-type granites, the nitrogen isotopic compositions are controlled by the initial isotopic compositions of their provenances. For I-type granites, the nitrogen isotope signature may be derived from a minor sedimentary component due to assimilation or ...
Dachun Zhang, Isaac R. Kaplan, Robert N. Clayton   +2 more
openaire   +1 more source

Measurement of the Background Activities of a 100Mo-enriched powder sample for AMoRE crystal material using a single high purity germanium detector

, 2020
The Advanced Molybdenum-based Rare process Experiment (AMoRE) searches for neutrino-less double-beta (0{\nu}\b{eta}\b{eta}) decay of 100Mo in enriched molybdate crystals. The AMoRE crystals must have low levels of radioactive contamination to achieve low
Hahn, Insik, Kang, Woon Gu, Kazalov, Vladimir, Kim, Gowoon, Kim, Yeong Duk, Lee, Eun Kyung, Lee, Moo Hyun, Leonard, Douglas S., Park, Su-yeon, Sala, Elena   +9 more
core   +2 more sources

Nitrogen Isotope Determination Method Using EA Isolink-IRMS: Comparison of Single/Double Furnace Modes and Evaluation of Measurement Accuracy

Zhipu Xuebao
Determination of nitrogen isotopes in natural samples plays an important role in scientific exploration of the global nitrogen cycle. However, compared with carbon isotope measurement, the accuracy of nitrogen isotope ratio determination is generally ...
Ye-kai WANG, Nan WANG, Yan-yan ZHAO, San-zhong LI, Xi-jie YIN   +4 more
doaj   +1 more source

A framework for tracing the sources of nitrate in surface water through remote sensing data coupled with machine learning

npj Clean Water
As an integral component of the global nitrogen cycle, nitrate are readily transferred from urban sewage discharge, agricultural activities, and atmospheric sedimentation to surface water. This paper introduces an innovative framework that combines multi-
Di Tian, Xinfeng Zhao, Lei Gao, Tao Jiang, Zuobing Liang, Zaizhi Yang, Pengcheng Zhang, Qirui Wu, Kun Ren, Chenchen Yang, Rui Li, Shaoheng Li, Yingjie Cao, Yingxue Xuan, Jianyao Chen, Aiping Zhu   +15 more
doaj   +1 more source

A New foodweb based on microbes in calcitic caves: The Cansiliella (Beetles) case in Northern Italy [PDF]

International Journal of Speleology, 2011
The troglobitic beetle, Cansiliella servadeii (Leptodirini), has specialized mouthparts modified for browsing and feeding under percolating water on moonmilk, a speleothem formation in Grotta della Foos, Italy. Results from analyses of stable isotopes of
Paoletti Maurizio G., Beggio Mattia, Dreon Angelo Leandro, Pamio Alberto, Gomiero Tiziano, Brilli Mauro, Dorigo Luca, Concheri Giuseppe, Squartini Andrea, Summers Engel Annette   +9 more
doaj  

Composition, isotopic fingerprint and source attribution of nitrate deposition from rain and fog at a Sub-Arctic Mountain site in Central Sweden (Mt Åreskutan)

Tellus: Series B, Chemical and Physical Meteorology, 2019
While dry and rain deposition of nitrate (NO3−) and ammonium (NH4+) are regularly assessed, fog deposition is often overlooked. This work assesses summer fog events contribution to nitrogen deposition and availability for forest ecosystems.
Carmen P. Vega, E. Monica Mårtensson, Ulla Wideqvist, Jan Kaiser, Paul Zieger, Johan StrÖm   +5 more
doaj   +1 more source